OPTION DEVICE, OPTION DEVICE FOR IMAGE FORMING DEVICE, OPTION PAPER FEEDING DEVICE FOR IMAGE FORMING DEVICE, IMAGE FORMING SYSTEM, MEMORY CONTROLLING METHOD FOR OPTION DEVICE, MEMORY CONTROLLING METHOD FOR OPTION PAPER FEEDING DEVICE, AND MEMORY MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a memory controlling method for an option device using an inexpensive memory such as a flash ROM as a memory means for storing data such as printing information without the need of using an expensive memory such as an EEPROM. SOLUTION: In an option paper feeding device for storing papers to be fed for an image forming device, comprising a nonvolatile memory means 203, and a CPU 201 for administering data to be transmitted to the memory means 203, in the case the CPU 201 senses passage of papers by a discharge detection sensor SNS 3, it counts the number of the papers passed by, and stores the same in the memory means 203. At the time of storing data in the memory means 203, in the case the CPU 201 counts a predetermined number of sheets, the count value is cleared so that the data are stored with the address to be stored in the memory means 203 replaced.